Question

Choose the correct statement from the following. (This question has multiple correct options).
A. $50^\circ {\text{C}}$ is equal to $122^\circ {\text{F}}$
B. A clinical thermometer cannot be sterilized using boiling water
C. Unequal expansion causes cracks in the walls of the buildings
D. Graphite is a bad conductor of heat

Answer 1

Use the formula for conversion of temperature in degree Celsius to temperature in degree Fahrenheit. Check the maximum temperature limit of the clinical thermometer and boiling point of water in degree Fahrenheit. Check the cause of cracks in a building. Also check about thermal conductivity of the graphite.

Complete step by step answer:
The formula for conversion of temperature in degree Celsius to degree Fahrenheit is as follows:
$F = \left( {C \times \dfrac{9}{5}} \right) + 32$
Here, $C$ is the temperature in degree Celsius and $F$ is the temperature in degree Fahrenheit.
Let us convert the unit of temperature $50^\circ {\text{C}}$ to degree Fahrenheit.
Substitute $50^\circ {\text{C}}$ for $C$ in the above equation.
$F = \left( {50^\circ {\text{C}} \times \dfrac{9}{5}} \right) + 32$
$\Rightarrow F = 90 + 32$
$\Rightarrow F = 122^\circ {\text{F}}$
Therefore, $50^\circ {\text{C}}$ is equal to $122^\circ {\text{F}}$. Hence, the statement given in option A is correct.
A clinical thermometer is the thermometer used by the doctors to measure the temperature of the patients. We know that the maximum range of the clinical thermometer is $122^\circ {\text{F}}$. But the temperature of the boiling water is $212^\circ {\text{F}}$. Hence, the clinical thermometer cannot be used with boiling water. The clinical thermometer is sterilized by using 3% hydrogen peroxide. Therefore, the clinical thermometer cannot be sterilized using boiling water. Hence, the statement given in option B is correct.
When a wall expands unusually there is expansion of the wall which is not uniform. If the wall expands non-uniformly, there is non-uniform expansion in the dimensions of the wall which can cause cracks in the wall and if the expansion is very non-uniform, the wall structure may collapse also. Therefore, unusual expansion of the wall may cause cracks in the wall of the building. Hence, the statement given in option C is correct.
The graphite has vibrations of the atoms in it which can transfer the heat in the graphite. Therefore, graphite is a good conductor of heat. Hence, the statement given in option D is incorrect.

Hence, the correct options are A, B and C.

Note: The students should be careful while using formula for conversion of temperature in degree Celsius to temperature in degree Fahrenheit. If this formula is not used properly, the students will not be able to check whether the statement given in option A is correct or incorrect.